/* 动画 */
@keyframes checkmarkAnimation {
    0% {
        transform: scale(0);
        opacity: 0;
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes popIn {
    0% {
        transform: scale(0.8);
        opacity: 0;
    }
    80% {
        transform: scale(1.2);
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

@keyframes slideInFromLeft {
    from {
        transform: translateX(-100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideInFromBottom {
    from {
        transform: translateY(100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* 媒体查询 */
@media (max-width: 768px) {
    .top-bar {
        flex-direction: column;
        align-items: flex-start;
    }
    .nav-menu ul {
        flex-direction: column;
        width: 100%;
    }
    .nav-menu li {
        margin: 10px 0;
    }
}